由于各种偶然的因素影响,造成同一对象多次测定的结果不完全一致,往往是有的稍高,有的稍

题型:单项选择题

问题:

由于各种偶然的因素影响,造成同一对象多次测定的结果不完全一致,往往是有的稍高,有的稍低,这种差异是()

A.系统误差

B.随机测量误差

C.抽样误差

D.偏倚误差

E.标准误差

考点:北京住院医师医院药师Ⅰ阶段医学统计学医学统计学题库
题型:单项选择题

在三时相骨显像的基础上,再加18~24小时延迟显像,常用于下肢和患有外周血管疾病或静脉功能不全时的骨显像检查是()

A.全身骨显像

B.局部骨显像

C.三时相骨显像

D.四时相骨显像

E.平而骨显像

题型:单项选择题

人们把英国议会称为“议会之母”的原因是[ ]

A.英国的议会是在与资产阶级和封建势力的斗争中产生的

B.资本主义国家在资产阶级革命或改良后效法英国建立议会制度

C.英国的议会实行三权分立

D.英国的一会具有立法权、财 * * 和监督权

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阅读下面关于“绿色植物光合作用的发现”的有关图解和材料,分析并回答相关问题:

材料一:A图中显示,17世纪比利时科学家海尔蒙特把一棵2.5千克的柳树种在装有90千克泥土的木桶里,只浇水。5年后,柳树长到了82千克,而称一下泥土的重量,大约只减少了90克。

材料二:B图中显示,18世纪英国科学家普利斯特利在一个密闭的钟罩内放一只老鼠,在另一个密闭的钟罩内放一只老鼠和一盆栽植物,且都供给足够的食物和饮水。他发现与植物在一起的老鼠能够长时间正常的生活,而另一只钟罩里的老鼠则很快死去了。

(1)从材料二的实验中可以得出的结论是_______。

A.光合作用产生了有机物

B. 绿色植物可以更新因为动物呼吸变得混浊的空气

C.水分是植物体建造自身的主要原料

D. 无机物是植物体建造自身的主要材料

(2)请你大胆地推测普利斯特利随后可能探讨的问题是_________________

(3)在海尔蒙特的实验中,泥土的重量减少了90克,主要是由于土壤中的___________被植物吸收利用了的缘故。

(4)而柳树吸收的水分大部分通过____________作用散失到大气中了。

(5)当你行走于东方红广场、漫步在雨湖公园或在田间村头,时常可见锻炼者的身影,有人说清晨锻炼好,亦有人认为傍晚锻炼好,你的观点是:___________,请简述你的理由:__________________________________________。

题型:单项选择题

Motivation is "the driving force within individuals that impels them to action." And goals are the sought-after results_____(1) motivated behavior.Motivation can be either positive or negative_____(2) direction. We may feel a driving force toward some object or condition, _____(3) a driving force away from some object or condition. For example, a person may be impelled toward a restaurant to fulfill a need, hunger, and away_____(4) an airplane to fulfill a need of safety. Some psychologists refer to positive drives_____(5) needs, wants or desires,_____(6) negative drives as fears or aversions._____ (7), though negative and positive motivational forces seem to differ dramatically_____(8) terms of physical and sometimes emotional activity, they are basically similar in_____(9) they both serve to initiate and sustain human behavior.____(10) this reason, researchers often refer _____(11) both kinds of drives or motives as needs, wants and desires.Goals, _____(12), can be either positive or negative. A positive goal is one toward_____ (13) behavior is directed and it is often referred to as an approach object. A negative goal is _____(14) from which behavior is directed away and it is sometimes referred to as an avoidance object. Since both approach and avoidance goals can be considered objectives of motivated behavior, most researchers refer to_____(15) types simply as goals. Consider this example. A middle-aged woman may wish to remain_____(16) attractive as possible. Her positive goal is to appear desirable, and_____(17) she may use a perfume advertised to make her irresistible. A negative goal may be to prevent her skin_____(18) aging, and therefore she may buy and use face creams._____(19) the former case, she uses perfume to help her achieve her positive goal — attractiveness; in the____(20) case, she uses face creams to help avoid a negative goal — wrinkled skin.

题型:单项选择题

依据《中华人民共和国价格法》,下列属于经营者正当价格行为的是()

A.相互串通,操纵市场价格,损害其他经营者或消费者的合法权益

B.为了排挤竞争对手或者独占市场,以低于成本的价格倾销

C.降价处理鲜活商品、季节性商品、积压商品

D.捏造、散布涨价信息,哄抬价格,推动商品价格过高上涨

E.提供相同商品或者服务,对具有同等交易条件的其他经营者实行价格歧视

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